Is there an easy way to degrease and de rust a K frame?

I did the oven cleaner/pressure washer thing and still had grime on the inside of the seams. I was trimming for the Milodon road race pan and seam welding anyway so I used a chisel to pop open the seams between the spot welds. This gave me access to the pinch. I also used a MAP gas torch to burn any grime out so the welds would be cleaner.